Means for protecting telephone, telegraph, and other service lines against induced currents from adjacent power lines



E. WEAVER i -Aug. 12, 1930.

H. 1,772,649 MEANS FOR PROTECTING TELEPHONE, TELEGRAPH, AND QTHER SERVICE LINES AGAINST INDUCED CURRENTS FROM ADJACENT POWER LIN'ES 2 Sheets-Sheet 1 Filed Sept. 27, 1927 E gmwntov I EJZVVEaxver;

I Aug; 12, 1930.

, E. H WEAVER 1,772,649 MEANS FOR PROTECTING TELEPHONE, TELEGRAPH, AND OTHER SERVICE LINES AGAINST N UC CURRENTS FROM ADJACENT POWER LINES Flled Sept 27 1927 2 Sheets-Sheet 2 Patented Aug. 12, 1930 PATENT OFFICE EDWARD H. WEAVER, F BLUEFIELD, WEST VIRGINIA MEANS FOR PROTECTING TELEPHONE, TELEGRAPH, AND OTHER- SERVICE LINES AGAINST INDUCED CURRENTS FROM ADJACENT POWER LINES Application filed September 27, 1927. Serial No. 222,388.

This invention relates to a novel and practical means for taking care of induced currents caused from failure on electrification circuits, with a minimum delay.

6 To that end the invention contemplates a novel circuit arrangement including relays which automatically function upon the occurrence of a short circuit in an adjacent or proximate power line or when said line is '10 overloaded, thereby to automatically ground the induced currents consequently set up between the power lines and adjacent telephone, telegraph, signal or other service lines in close proximity to the power feeders.

A further object of the invention is to pro vide a system of relays wherein the relays included in the power circuit are set to function ahead of the relays used to open the power circuits when shorts or overloads occur, thereby insuring the full protection of equipment during the period of induced current and also protection to persons maintaining equipment.

With the above and other objects in view which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fullydescribcd, illustrated and claimed.

A preferred and practical embodiment of the invention is shown in the accompanying drawings, in which Figure 1 of the drawings illustrates one arrangement adapted to be used in carrying the invention into efiect.

' considerable, annoyance and difiiculty and considerable expense and loss of time in the maintenance of proper operating conditions on telephone, telegraph, signal and other circuits. Therefore, the present invention pro poses to eliminate the difiiculties heretofore encountered in a simple and practical way, and by reference to Figure 1 it will be observed that 1, 2, 3 and 4: respectively designate telephone, telegraph, wired wireless and signal circuits which are operated near direct and alternating power feeders A, B and C, the power feeder A being a direct current power feeder and B being an alternating current power feeder while C is an alternating current trolley feeder, by Way of example.

Referring first to the direct current power feeder and its effect and operation in conjunction with the working circuits referred to, it will be observed that one side of the direct current power line A is included in circuit with the movable armature of a relay designated generally as R. The said armature of the relay is provided with a ground connection G and a plurality of shunt terminals 5 which are provided with shuntconnections 6 leading to the work or service circuit wires 1, 2, 3 and 4 previously referred to. The relay R is normally open as shown, and when an overload orshortcircuitoccursin the direct current power feeder line, the ar mature a of the relay R is automatically closed thus grounding all of the shunt connections 6 through the terminals 5. When the disturbance is relieved by the circuit breaker in the power circuit A the relay R will automatically open, thus relieving the working circuits 1, 2, 3 and 4 of the ground connection and restoring normal operation. In connection with the alternating current feeders B and C it will be observed that there is provided a secondary relay SR, the same having its movable armature (1 provided with a ground connection G and the said. armature being adapted to operate in conjunction with a series of shunt terminals 5" which are electrically connected with the service lines or circuits through the medium of the shunt connections 6. The said armature a of the secondary relay is shown in its normallyopen'positionin Figure land. is adapted to be included in a circuit which is closed by o no or more primary relays PR. Thu; is to say, the primary relays PR are provided with l l are included in a is energized it c Y \i J: n theieo i col-rightin en t 1 SR which automatically .nding the service lines. t breaker the power oncircuit or hie to short W r w lilllolollllel CllClllL J.

t e ret to function ahead of pen the power ciicuits cur. thereby pl'l the period relays in ui'iderstood that th i'eeri r lines F F and F F F and P In this arrangement. it a short circuitshould develop on teeder F i nrimary relays 1i and Y operate innnediatelv but relay M is set to function ahead of relay N thereby grounding circuits through relay no. prior to relay N breaking the power circuit through the oil circuit breakers. As

tee power system is urbance and the current deenernized. This autoand SE from his, 13

soon as rah. relieved of 1? f nctions I nsror n r El nrt cally releases relays 5 'nd circuits.

7 are 3 of the drawings shows a further iueaus "tor carrying the invention into effect in connection with a signal track circuit.

lhe secondary relay SR is provided with ground terminals and ground connections G and the primary relay O includes terminals adapted to be included in a battery or other circuit E thereby to close the circuit to the armature ot the secondary relay when the armature of the primary relay is energized from the current transformer circuit F, the said current trz nslormer being coupled with impedance bond 1 ar'anged across the ial circuit. lit the time secondary relay operates it opens circuit to signal relay This also adaptable to he used as a shown in F 1 and 2. e primar relay circuit and n 3 this Form of system can a ed from direct current track circuit.

y hcior; groanuling: lino side of same.

ype o relay :cc ,nda v relay 2 sides in connecting the service lines which operate near power lines with an automatic relav which grounds the service lines during the period oi the induced current, thereby not only insuring safety to personnel hut safety to equipment when unusual conditions occur in the power line.

Without further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the term, proportion and minor details of construction may he resorted to without departing from the spirit of the invention and scope of the appended. claims.

I claim 1. deans for protecting telephone, telegraph. signal and other circuits ope 'ated near electric power lines, comprising a relay having a ground connection and shunt terminals, shunt connections between said circuits and the shunt terminals, and means for actuating the relay when surging occurs in the power line to connect the shunt terminals with the ground, said means comprising a source of electrical energy and inductance operated means for closing the circuit from said source of electrical energy to the relay.

2. Means tor protecting telephone, telegraph, signal and other service circuits operated near electric power lines comprising a secondary relay having a normally inoperative ground. connection, shunt terminals on said secondary relay, shunt connections hetween the said service circuits and the shunt terminals, a source 01. electrical energy, a primary relay having terminals included in circuit with the source of electrical energy and with the secondary relay, and means for actuating the primary relay to close the last mentioned circuit with the secondary relay comprising a transformer circuit responsive to surging in the power lines.

3. Ucans for protecting telephone and teleg "aph signal and other circuits operated near alternating and direct current power lines, comprising a relay having a ground connection and shunt terminals, shunt connections between said circuits and the shunt terminals and said relay being included in a part of the direct current power line circuit,

signature.

EDWARD H. WEAVER. 

